* feature: Webhook message edit & delete functionality

* PR fixes: Rename Edit* to Modify*; Add more detailed docstrings; Small validation fixes

* Fix spacing around docstrings

* Make ModifyWebhookMessageParams.Content Optional<string>

* Change the Webhook message edit functionality to use a object delegate method instead providing the all parameters

Co-authored-by: Desmont <desmont@users.noreply.github.com>

* Throw exception with CustomStatus

* Add remark instead of exception

* Change wording

Fix breaking change introduced by #1521

* fixed a deadlock in DiscordShardedClient during a failed Identify due to InvalidSession

* fixed log

* Don't wait ready before releasing semaphore

Co-authored-by: Paulo <pnmanjos@hotmail.com>

* Implemented Pending property

* Implemented changes

* feature: Add MessageFlags and AllowedMentions to Modify

* Change exception message

Added SocketApplicationCommands, Added method in SocketGuild to fetch that guilds ApplicationCommands.

Tested all rest routes and fixed them accordingly.

Did more testing and I think its ready to go

New Rest entities: RestApplicationCommand,RestGlobalCommand, RestGuildCommand, RestApplicationCommandOption, RestApplicationCommandChoice, RestApplicationCommandType.

Added public methods to the RestClient to fetch/create/edit interactions.

* fixes #1495

* keep obsolete properties and return types for compatibility

* missing properties for SocketInvite

* Restore xml docs and change obsolete message

Co-authored-by: Paulo <pnmanjos@hotmail.com>

Signed-off-by: Still Hsu <dev@stillu.cc>

* Fix: HasAllMembers is false if a user left

* Fix: Correct boolean logic

* Update SocketGuild.cs

* Fix returns value docs

Signed-off-by: Still Hsu <dev@stillu.cc>

Co-authored-by: Still Hsu <dev@stillu.cc>

The inherited summary incorrectly stated that all users who _see_ the channel are returned when in reality only the ones _connected_ are.

* Add inline replies

* Missed a few things

* Change xml docs, IUserMessage, and other changes

* Missed one when changing

* Fix referencedMessage author